Waterproof fabric and submarine: what they have in common

1. Step 1. Waterproof fabric — evolved into — Membrane fabric. A breathable waterproof fabric.
2. Step 2. Membrane fabric — is made of — Teflon. Expanded PTFE.
3. Step 3. Teflon — is material for — Air fryer. A basket with a non-stick coating.
4. Step 4. Air fryer — has part — Electric fan. A fan.
5. Step 5. Electric fan — has part — Propeller. The blades.
6. Step 6. Propeller — is part of — Submarine. A propeller.

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